Twenty-something girls vs. thirty-something women - S2-E17
Continuity mistake: Carrie and the doctor are dating for the day after and a waiter approaches on the left. A shot later he disappears.
Twenty-something girls vs. thirty-something women - S2-E17
Continuity mistake: When Carrie meets the doctor there's a waiter behind them who walks away towards Carrie's direction but suddenly disappears in the following shot.
Take me out to the ballgame - S2-E1
Continuity mistake: When Charlotte shows the newspaper to her friends it is wrinkled all over, but a shot later it is neatly folded.
Answer: A popular brand of sexual lubricant. See http://www.k-y.com/index.jsp.
J I Cohen